Caisteal Grugaig is an Iron Age broch standing on a small rocky knoll on a grassy slope. The 'Glenelg Brochs' of Dun Telve and Dun Troddan are a few miles to the south. Caisteal Grugaig should not be confused with the 'semi-broch' known as Dun Grugaig which is also near Glenelg.
The broch has an external diameter of around 16.5 metres and an internal diameter of around 9.6 metres. The broch was built on uneven ground, so the natural floor of the broch has a slope. The entrance passage is on the northeast side and has a massive triangular lintel over the doorway. There is an elongated guard cell on the left side of the entrance passage.
The interior of the broch has two intramural rooms at ground level, one of which is a small, oval cell. The other is a long mural cell, or length of ground gallery, which has a blocked doorway. The sides of an upper room are apparent above the entrance passage. Also inside the broch is a doorway to the mural stair. The five steps of the stair lead up to a long landing which leads to the beginning of a second flight of stairs.
References:The Château du Lude is one of the many great châteaux of the Loire Valley in France. Le Lude is the most northerly château of the Loire Valley and one of the last important historic castles in France, still inhabited by the same family for the last 260 years. The château is testimony to four centuries of French architecture, as a stronghold transformed into an elegant house during the Renaissance and the 18th century. The monument is located in the valley of Le Loir. Its gardens have evolved throughout the centuries.